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      <b>dvcrss_c</b> </td>
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            <small>
              <a href="#Procedure">Procedure<br></a>
              <a href="#Abstract">Abstract<br></a>
              <a href="#Required_Reading">Required_Reading<br></a>
              <a href="#Keywords">Keywords<br></a>
              <a href="#Brief_I/O">Brief_I/O<br></a>
              <a href="#Detailed_Input">Detailed_Input<br></a>

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              <small>               <a href="#Detailed_Output">Detailed_Output<br></a>
              <a href="#Parameters">Parameters<br></a>
              <a href="#Exceptions">Exceptions<br></a>
              <a href="#Files">Files<br></a>
              <a href="#Particulars">Particulars<br></a>
              <a href="#Examples">Examples<br></a>

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              <small>               <a href="#Restrictions">Restrictions<br></a>
              <a href="#Literature_References">Literature_References<br></a>
              <a href="#Author_and_Institution">Author_and_Institution<br></a>
              <a href="#Version">Version<br></a>
              <a href="#Index_Entries">Index_Entries<br></a>
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<h4><a name="Procedure">Procedure</a></h4>
<PRE>
   void dvcrss_c ( ConstSpiceDouble s1  [6],
                   ConstSpiceDouble s2  [6],
                   SpiceDouble      sout[6] ) 

</PRE>
<h4><a name="Abstract">Abstract</a></h4>
<PRE>
   Compute the cross product of two 3-dimensional vectors 
   and the derivative of this cross product. 
</PRE>
<h4><a name="Required_Reading">Required_Reading</a></h4>
<PRE>
   None. 
</PRE>
<h4><a name="Keywords">Keywords</a></h4>
<PRE>
   VECTOR 
   DERIVATIVE
   MATH


</PRE>
<h4><a name="Brief_I/O">Brief_I/O</a></h4>
<PRE>
 
   VARIABLE  I/O  DESCRIPTION 
   --------  ---  -------------------------------------------------- 
   s1        I   Left hand state for cross product and derivative. 
   s2        I   Right hand state for cross product and derivative. 
   sout      O   State associated with cross product of positions. 
 </PRE>
<h4><a name="Detailed_Input">Detailed_Input</a></h4>
<PRE>
 
   s1       This may be any state vector.  Typically, this 
            might represent the apparent state of a planet or the 
            Sun, which defines the orientation of axes of 
            some coordinate system. 
 
   s2       A state vector. 
 </PRE>
<h4><a name="Detailed_Output">Detailed_Output</a></h4>
<PRE>
 
   sout     This variable represents the state associated with the 
            cross product of the position components of 's1' and 's2.' 
            In otherwords if s1 = (P1,V1) and s2 = (P2,V2) then 
            'sout' is ( P1xP2, d/dt{ P1xP2 } ) 
 
            'sout' may overwrite 's1' or 's2'. 
 </PRE>
<h4><a name="Parameters">Parameters</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Exceptions">Exceptions</a></h4>
<PRE>
 
   Error free. 
 
   1) If 's1' and 's2'  are large in magnitude (taken together, 
      their magnitude surpasses the limit allow by the 
      computer) then it may be possible to generate a 
      floating point overflow from an intermediate 
      computation even though the actual cross product and 
      derivative may be well within the range of double 
      precision numbers. 
 
      <b>dvcrss_c</b> does NOT check the magnitude of 's1' or 's2'  to 
      insure that overflow will not occur. 
 </PRE>
<h4><a name="Files">Files</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Particulars">Particulars</a></h4>
<PRE>
 
   <b>dvcrss_c</b> calculates the three-dimensional cross product of two 
   vectors and the derivative of that cross product according to 
   the definition.  The components of this state are stored 
   in a local buffer vector until the calculation is complete. 
   Thus sout may overwrite 's1' or 's2'  without interfering with 
   intermediate computations. 
 </PRE>
<h4><a name="Examples">Examples</a></h4>
<PRE>
 
          s1                    s2                   sout 
   ----------------------------------------------------------------- 
   (0, 1, 0, 1, 0, 0)  ( 1,  0,  0, 1, 0, 0)  (0, 0, -1, 0,  0, -1 ) 
   (5, 5, 5, 1, 0, 0)  (-1, -1, -1, 2, 0, 0)  (0, 0,  0, 0, 11,-11 ) 
 </PRE>
<h4><a name="Restrictions">Restrictions</a></h4>
<PRE>
 
   None. 
     </PRE>
<h4><a name="Literature_References">Literature_References</a></h4>
<PRE>
 
   None.
</PRE>
<h4><a name="Author_and_Institution">Author_and_Institution</a></h4>
<PRE>
 
   W.L. Taber      (JPL) 
   E.D. Wright     (JPL)
 </PRE>
<h4><a name="Version">Version</a></h4>
<PRE>
 
   -CSPICE Version 1.0.0, 23-NOV-2009 (EDW)
</PRE>
<h4><a name="Index_Entries">Index_Entries</a></h4>
<PRE>
 
   Compute the derivative of a cross product 
 </PRE>
<h4>Link to routine dvcrss_c source file <a href='../../../src/cspice/dvcrss_c.c'>dvcrss_c.c</a> </h4>

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   <pre>Wed Jun  9 13:05:21 2010</pre>

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